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Physics MCQs for NEET — Practice Questions with Answers

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A wave travelling along a string is described by the equation y= A Sin(ùt-kx). The maximum particle velocity is ………..

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Explanation

$ y (x, t) = 0.005 cos ( \alpha x - \beta t) $ compare it with standard equation $ y (x,t ) = A cos (kx -wt ) = A cos \left( { 2 \pi \over \lambda } = - { 2 \pi \over T }t \right) $ $ \therefore \alpha = { 2 \pi \over \lambda } and \beta = { 2 \pi \over T } $

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Two tuning forks P and Q when set vibrating gives 4 beats/second. If the prong of fork P is filed, the beats are reduced to 2/s. What is the frequency of P, if that of Q is 250 hz.?

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The length of a string tied across two rigid supports is 40 cm. The maximum wavelength of a stationary wave that can be produced in it is… cm.

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Explanation

For a string tied between two fixed supports, the longest (or maximum) wavelength of a stationary wave that can be produced is twice the length of the string. Given the length of the string is 40 cm, the maximum wavelength is: $$ ext{Wavelength} = 2 imes 40 ext{ cm} = 80 ext{ cm}$$

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A stationary wave of frequency 200 hz are formed in air. If the velocity of the wave is 360 m/s, the shortest distance between two antinodes is …….m

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A tuning fork produces 8 beats per second with both 80 cm and 70 cm of stretched wire of a sonometer. Frequency of the fork is …….hz.

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An open pipe is in resonance in 2nd harmonic with frequency f . Now one end of the tube is closed and frequency is increased to f2, such that the resonance again occurs in the nth harmonic. Choose the correct option.

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Explanation

When an open pipe is in resonance in its 2nd harmonic, the frequency is given by $f = rac{2v}{2L}$, where $L$ is the length of the pipe. If one end of the pipe is closed, the pipe behaves like a closed pipe, and the nth harmonic for a closed pipe is given by the odd harmonics (1, 3, 5, ...). For the pipe to resonate again, the frequency must be adjusted. For $n = 5$, the frequency $f_2$ would be $ rac{5v}{4L}$. Therefore, $f_2 = rac{5}{4} f$. Hence, the correct option is $n = 5, f_2 = (5 / 4) f_1$.

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Assertion – Reason type questions : For the following questions, statement as well as the reason(s) are given. Each questions has four options. Select the correct option. Statement – 1: Two waves moving in a uniform string having uniform tension cannot have different velocities. Statement – 2 : Elastic and inertial properties of string are same for all waves in same string. Moreover speed of wave in a string depends on its elastic and inertial properties only.

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Assertion – Reason type questions : For the following questions, statement as well as the reason(s) are given. Each questions has four options. Select the correct option. Statement – 1: When a sound source moves towards observer, then frequency of sound increases. Statement – 2 : Wavelength of sound in a medium moving towards the observer decreases.

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Assertion – Reason type questions : For the following questions, statement as well as the reason(s) are given. Each questions has four options. Select the correct option. Statement – 1: Newton’s equation for speed of sound was found wrong because he assumed the process to be isothermal. Statement – 2 : When sound propagates, the compressions and rarefactions happen so rapidly that there is not enough time for heat to be distributed.

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Explanation

Newton initially assumed that the propagation of sound in air was an isothermal process (constant temperature). However, it was later found that the process is actually adiabatic (no heat exchange due to rapid compression and rarefaction). The rapid compressions and rarefactions in sound waves do not allow enough time for heat to be distributed, thus making the process adiabatic. Therefore, both statements are true, and statement 2 correctly explains why Newton's assumption was incorrect.

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Assertion – Reason type questions : For the following questions, statement as well as the reason(s) are given. Each questions has four options. Select the correct option. Statement – 1 : When pressure in a gas changes, velocity of sound in gas may change. Statement – 2 : Velocity of sound is directly proportional to square root of pressure.

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Explanation

The velocity of sound in a gas is given by the formula \( v = \sqrt{\frac{\gamma P}{\rho}} \), where \( v \) is the velocity, \( \gamma \) is the adiabatic index, \( P \) is the pressure, and \( \rho \) is the density. When the pressure in a gas changes, the velocity of sound may change, but this change is not directly proportional to the square root of pressure alone; it also depends on the density of the gas. Hence, statement 1 is true, statement 2 is true, but statement 2 is not the correct explanation of statement 1.

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